Re: [PATCH v3 24/28] kbuild: Generate the noreturn list and validate modules against it

[Nicolas Schier]

On Mon, Sep 21, 2026 at 03:31:25PM -0700, Josh Poimboeuf wrote:
> Most of the remaining hard-coded noreturn functions are exported symbols
> which live in vmlinux.o.  The objtool vmlinux.o pass can detect them
> automatically, but modules can't.
> 
> Instead of hard-coding them in noreturns.h, dynamically generate the
> list in a new scripts/noreturns.builtin file, which objtool on modules
> can then read.  That allows most of the remaining hard-coded noreturn
> entries to go away, including the Rust ones.  Note this means that
> modules need to be linked after vmlinux.o has been built and analyzed by
> objtool.
> 
> Objtool running on OOT modules will also need to read the generated
> file.  Its location in scripts/ should ensure it gets installed with
> kernel build files automatically.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
> ---
>  Makefile                                |  8 +++++
>  scripts/.gitignore                      |  1 +
>  scripts/Makefile.modfinal               | 15 ++++++--
>  scripts/Makefile.vmlinux_o              |  2 ++
>  tools/objtool/Documentation/objtool.txt |  8 ++---
>  tools/objtool/check.c                   | 46 -------------------------
>  tools/objtool/noreturns.h               | 17 ++-------
>  7 files changed, 29 insertions(+), 68 deletions(-)
> 

Reviewed-by: Nicolas Schier <n.schier@xxxxxxxxx>

-- 
Nicolas